Rosin size solution



UNITED STATES,

PATENT OFFICE.

JUDSON A. DE GEW, OF NEW YORK, N. Y., ASSIG-NOR TO PROCESS ENGINEERS, IN0., A. CORPORATION OF NEW YORK.

ROSIN SIZE SOLUTION.

Specification of'Letters Patent. Patented June 21, 1921.

No Drawing. Application filed April 10, 1919, Serial No. 289,126.Renewed April 13, 1921. Serial No.

T 0 all whom a may concern Be it known that I, Jonson A. DE CEW, asubject of the King of Great Britain. and native of the Dominion ofCanada, residing at 501 Fifth avenue, New York, N. Y., have inventedcertain new and useful Improvements in Rosin Size Solutions, of whichthe foll wing is a specification,

While it is well known in the art that paper may be made water repellentin the manufacturing process, by incorporating into the paper stock asolution of rosin soap and precipitating it upon th fibers by means ofaluminum sulfate, with the formative of acid resinates of aluminum, yetin spite of the most efiicient methods of operation, there are someconditions in whichthe properties of rosin itself do not seem to besufficient to meet the strains and destructive mechanical conditions ofthe drying and calendering treatments.

The object of this invention is to so modify or alter the properties ofrosin hydrates or complexes precipitated in the beating engine, thatthey will be less liable to become dehydrated or otherwise destroyedduring the drying process, and that the dried size will be more elasticand water repellent than before. V.

In order to accomplish this I incorporate into the size composition anoil or soap made from an oil which has special elastic and waterrepellent properties when dried, such as linseed, China wood or othersocalled varnish or drying oils.

The amount of these special oils or soaps that may be incorporated intothe rozin size will depend upon the extent to'which it is desired tomodify the properties obtained from rosin, but for purposes ofovercoming the actions destructive to sizing on the paper machine, thequantity of these oils or soaps required may vary from 5 per cent. to 50per cent. of the amount of rosin soap used.

When it is desired to make the rosin size particularly pliable, strongand water repellent, as much as 50 per cent. of the total size mayconsist of an oil soap compound made from a drying oil. Such sizes, whenprecipitated with aluminum sulfate in the paper and dried on the papermachine undergo considerable oxidation; but, instead of the oxidationbeing destructive to the sizing, as it is to rosin size alone, theproperties of this blended material actually develop and improve afteroxidation.

.The best sizing compound is produced when soap compounds made fromdrying oils are blended with a rosin soap containing a considerableamount of unsaponified rosin.

One method of combining the properties of these two materials is todissolve the unsaponified rosin in soap made from a drying oil, it beingpossible to dissolve together equal quantities of rosin and such oilsoap. Another method would be to dissolve a drying oil in a soap madefrom a drying oil and blend this with a rosin soap containing freerosin.

All of the sizing precipitates in which these oil soaps have beenincorporated will be more fusible on the paper machine driers than thosemade from rosin size alone, and this property is one of the greatadvantages arising from this composition, as it enables the sizing tore-melt when cracks are formed in drying, and as a result much morewaterproof paper can be made.

Although this invention relates to improving rosin size, the realinvention is the water-proofing quality of the precipitates of soapsmade from a drying oil and in order to get certain ideal resultsregardless of expense, it may be desirable to use the oil soap alone oremulsions of oil in the oil soap.

What I claim as m invention is:

l. A sizing composltion having therein a rosin soap, rosin, and a soapmade from a dryin oil.

2. A sizing composition having therein rosin and a soap made from adrying oil.

3. A sizing composition having therein rosin, rosin soap and a dryingoil.

4. A sizing composition having therein rosin soap and a drying oil.

5. A sizing composition having therein a drying oil, soap made. from adrying oil, rosin and rosin soap.

6. A sizing composition having therein a soap made from a drying oilcontaining an unsaponified oil.

In testimony whereof, I have signed my name to this specification, thisseventh day of April 1919.

-' JUDSON A. DE 'CEW.

